Testing is the final step before any layout goes live. What looks good on one screen may not look good on another. That is why you should always preview your design on multiple devices before publishing.
Check how the text wraps. Check how the images scale. Check how the spacing holds up. Each device will reveal something slightly different. This is especially true for responsive grids.
A three-column layout might look great on a 27-inch monitor, but it will fail on a 6-inch phone if the columns aren’t set up correctly. By testing early and often, you catch those issues before your readers do.
A tested layout is a trusted layout. It works everywhere, for everyone.
